turtles.js

/* eslint-disable no-undef */
/**
 * @file This contains the prototype of the Turtles component.
 * @author Walter Bender
 *
 * @copyright 2014-2020 Walter Bender
 * @copyright 2020 Anindya Kundu
 *
 * @license
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the The GNU Affero General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Suite 500 Boston, MA 02110-1335 USA.
 */

/*
   global createjs, platformColor, last, importMembers, setupRhythmActions, setupMeterActions,
   setupPitchActions, setupIntervalsActions, setupToneActions, setupOrnamentActions,
   setupVolumeActions, setupDrumActions, setupDictActions, _, Turtle, TURTLESVG, METRONOMESVG,
   FILLCOLORS, STROKECOLORS, getMunsellColor, DEFAULTVALUE, DEFAULTCHROMA,
   jQuery, docById, LEADING, CARTESIANBUTTON, piemenuGrid, CLEARBUTTON, COLLAPSEBUTTON,
   EXPANDBUTTON, MBOUNDARY
 */

/* exported Turtles */

// What is the scale factor when stage is shrunk?
const CONTAINERSCALEFACTOR = 4;

/**
 * Class for managing all the turtles.
 *
 * @class
 * @classdesc This is the prototype of the Turtles controller which
 * acts as a bridge between the Turtles model and the Turtles view,
 * and serves as a gateway to any external code.
 *
 * External code instantiates this class, and can access all the members
 * of TurtlesView and TurtlesModel.
 *
 * This component contains properties and controls relevant to the set
 * of all turtles like maintaining the canvases on which turtles draw.
 */
class Turtles {
    /**
     * @constructor
     */
    constructor(activity) {
        // Import members of model and view (arguments only for model)
        importMembers(this, "", [activity]);
        // Inititalize all actions related to blocks executed by Turtle objects
        this.initActions();
    }

    /**
     * Inititalizes all supporting action related classes & methods of Turtle.
     *
     * @returns {void}
     */
    initActions() {
        setupRhythmActions(this.activity);
        setupMeterActions(this.activity);
        setupPitchActions(this.activity);
        setupIntervalsActions(this.activity);
        setupToneActions(this.activity);
        setupOrnamentActions(this.activity);
        setupVolumeActions(this.activity);
        setupDrumActions(this.activity);
        setupDictActions(this.activity);
    }

    /**
     * Adds turtle to start block.
     *
     * @param {Object} startBlock - name of startBlock
     * @param {Object} infoDict - contains turtle color, shade, pensize, x, y, heading, etc.
     * @returns {void}
     */
    addTurtle(startBlock, infoDict) {
        this.add(startBlock, infoDict);
        if (this.isShrunk()) {
            const lastTurtle = this.getTurtle(this.getTurtleCount() - 1);
            lastTurtle.container.scaleX = CONTAINERSCALEFACTOR;
            lastTurtle.container.scaleY = CONTAINERSCALEFACTOR;
            lastTurtle.container.scale = CONTAINERSCALEFACTOR;
        }
    }

    /**
     * Add a new turtle for each start block.
     * Creates container for each turtle.
     *
     * @param startBlock - name of startBlock
     * @param infoDict - contains turtle color, shade, pensize, x, y, heading, etc.
     * @returns {void}
     */
    add(startBlock, infoDict) {
        if (startBlock !== null) {
            // console.debug("adding a new turtle " + startBlock.name);
            if (startBlock.value !== this.getTurtleCount()) {
                startBlock.value = this.getTurtleCount();
                // console.debug("turtle #" + startBlock.value);
            }
        }

        const blkInfoAvailable =
            typeof infoDict === "object" && Object.keys(infoDict).length > 0 ? true : false;

        // Unique ID of turtle is time of instantiation for the first time
        const id =
            blkInfoAvailable && "id" in infoDict && infoDict["id"] !== Infinity
                ? infoDict["id"]
                : Date.now();

        const turtleName = blkInfoAvailable && "name" in infoDict ? infoDict["name"] : _("start");

        // Instantiate a new Turtle object
        const turtle = new Turtle(this.activity, id, turtleName, this, startBlock);

        // Add turtle model properties and store color index for turtle
        this.addTurtleStageProps(turtle, blkInfoAvailable, infoDict);

        const turtlesStage = this.activity.stage;

        let i = this.getTurtleCount() % 10; // used for turtle (mouse) skin color
        this.pushTurtle(turtle); // add new turtle to turtle list

        if (startBlock === null) {
            // Hidden start block for when there are no start blocks
            return;
        }

        if (startBlock.name === "start") {
            this.createArtwork(turtle, i, true);
        } else {
            // Search for companion and use that turtle's colors.
            for (let j = 0; j < this.getTurtleCount(); j++) {
                if (this.getTurtle(j).companionTurtle === this.getTurtleCount() - 1) {
                    i = j % 10;
                    break;
                }
            }
            this.createArtwork(turtle, i, false);
        }

        this.createHitArea(turtle);

        /*
        ===================================================
         Add event handlers
        ===================================================
        */

        turtle.container.on("mousedown", event => {
            const scale = this.scale;
            const offset = {
                x: turtle.container.x - event.stageX / scale,
                y: turtle.container.y - event.stageY / scale
            };

            turtlesStage.dispatchEvent("CursorDown" + turtle.id);
            // console.debug("--> [CursorDown " + turtle.name + "]");

            turtle.container.removeAllEventListeners("pressmove");
            turtle.container.on("pressmove", event => {
                if (this.isShrunk() || turtle.running) {
                    return;
                }

                turtle.container.x = event.stageX / scale + offset.x;
                turtle.container.y = event.stageY / scale + offset.y;
                turtle.x = this.screenX2turtleX(turtle.container.x);
                turtle.y = this.screenY2turtleY(turtle.container.y);
                this.activity.refreshCanvas();
            });
        });

        turtle.container.on("pressup", () => {
            // console.debug("--> [CursorUp " + turtle.name + "]");
            turtlesStage.dispatchEvent("CursorUp" + turtle.id);
        });

        turtle.container.on("click", () => {
            // If turtles listen for clicks then they can be used as buttons
            // console.debug("--> [click " + turtle.name + "]");
            turtlesStage.dispatchEvent("click" + turtle.id);
        });

        turtle.container.on("mouseover", () => {
            // console.debug("--> [mouseover " + turtle.name + "]");
            turtlesStage.dispatchEvent("CursorOver" + turtle.id);

            if (turtle.running) {
                return;
            }

            turtle.container.scaleX *= 1.2;
            turtle.container.scaleY = turtle.container.scaleX;
            turtle.container.scale = turtle.container.scaleX;
            this.activity.refreshCanvas();
        });

        turtle.container.on("mouseout", () => {
            // console.debug("--> [mouseout " + turtle.name + "]");
            turtlesStage.dispatchEvent("CursorOut" + turtle.id);

            if (turtle.running) {
                return;
            }

            turtle.container.scaleX /= 1.2;
            turtle.container.scaleY = turtle.container.scaleX;
            turtle.container.scale = turtle.container.scaleX;
            this.activity.refreshCanvas();
        });

        document.getElementById("loader").className = "";

        this.addTurtleGraphicProps(turtle, blkInfoAvailable, infoDict);
        this.activity.refreshCanvas();
    }

    /**
     * Toggles 'running' boolean value for all turtles.
     *
     * @returns {void}
     */
    markAllAsStopped() {
        for (let i = 0; i < this.getTurtleCount(); i++) {
            const turtle = this.getTurtle(i);
            turtle.running = false;
        }

        this.activity.refreshCanvas();
    }

    // ================================ MODEL =================================
    // ========================================================================

    /**
     * @param {Object} stage
     */
    set masterStage(stage) {
        this._masterStage = stage;
    }

    /**
     * @returns {Object} - master stage object
     */
    get masterStage() {
        return this._masterStage;
    }

    /**
     * @param {Object} stage
     */
    set stage(stage) {
        this._stage = stage;
        this._stage.addChild(this._borderContainer);
    }

    /**
     * @returns {Object} - stage object
     */
    get stage() {
        return this._stage;
    }

    /**
     * @param {Object} canvas
     */
    set canvas(canvas) {
        this._canvas = canvas;
    }

    /**
     * @return {Object} canvas object
     */
    get canvas() {
        return this._canvas;
    }

    /**
     * @returns {Object} border container object
     */
    get borderContainer() {
        return this._borderContainer;
    }

    /**
     * @param {Function} hideMenu - hide auxiliary menu
     */
    set hideMenu(hideMenu) {
        this._hideMenu = hideMenu;
    }

    /**
     * @returns {Function} hide auxiliary menu
     */
    get hideMenu() {
        return this._hideMenu;
    }

    /**
     * @param {Function} doClear - reset canvas and turtles
     */
    set doClear(doClear) {
        this._doClear = doClear;
    }

    /**
     * @returns {Function} reset canvas and turtles
     */
    get doClear() {
        return this._doClear;
    }

    /**
     * @param {Function} hideGrids - hide canvas gridwork
     */
    set hideGrids(hideGrids) {
        this._hideGrids = hideGrids;
    }

    /**
     * @returns {Function} hide canvas gridwork
     */
    get hideGrids() {
        return this._hideGrids;
    }

    /**
     * @param {Function} doGrid - show canvas gridwork
     */
    set doGrid(doGrid) {
        this._doGrid = doGrid;
    }

    /**
     * @returns {Function} show canvas gridwork
     */
    get doGrid() {
        return this._doGrid;
    }

    /**
     * @returns {Object[]} list of Turtle objects
     */
    get turtleList() {
        return this._turtleList;
    }

    // ================================ VIEW ==================================
    // ========================================================================

    /**
     * @returns {Number} scale factor
     */
    get scale() {
        return this._scale;
    }
}

/**
 * Class pertaining to Turtles Model.
 *
 * @class
 * @classdesc This is the prototype of the Model for the Turtles component.
 * It should store the data structures that control behavior of the model,
 * and the methods to interact with them.
 */
Turtles.TurtlesModel = class {
    /**
     * @constructor
     */
    constructor(activity) {
        this.activity = activity;
        this._masterStage = null; // createjs stage
        this._stage = null; // createjs container for turtle

        this._canvas = null; // DOM canvas element

        // These functions are directly called by TurtlesView
        this._hideMenu = null; // function to hide aux menu
        this._doClear = null; // function to clear the canvas
        this._hideGrids = null; // function to hide all grids
        this._doGrid = null; // function that renders Cartesian/Polar
        //  grids and changes button labels

        // createjs border container
        this._borderContainer = new createjs.Container();

        this._masterStage = this.activity.stage;
        this._stage = this.activity.turtleContainer;
        this._stage.addChild(this._borderContainer);
        this._canvas = this.activity.canvas;
        this._hideMenu = this.activity.hideAuxMenu;
        this._hideGrids = this.activity.hideGrids;
        this._doGrid = this.activity._doCartesianPolar;

        // List of all of the turtles, one for each start block
        this._turtleList = [];
    }

    /**
     * Initializes the turtleList with a given list of turtles.
     *
     * @param {Array} turtles - Array of turtle objects to initialize the list.
     * @returns {void}
     */
    initializeTurtleList(turtles) {
        this._turtleList = turtles;
    }

    /**
     * Returns the turtle at the specified index.
     *
     * @param {Number} index - The index of the turtle to retrieve.
     * @returns {Object} The turtle object at the specified index.
     */
    getTurtle(index) {
        const turtle = this._turtleList[index];
        if (!turtle) {
            throw new Error(`Turtle ${index} not found`);
        }
        return turtle;
    }

    /**
     * Returns the number of turtles in the turtleList.
     *
     * @returns {Number} The number of turtles.
     */
    getTurtleCount() {
        return this._turtleList.length;
    }

    /**
     * Save the Turtle object to the TurtleList.
     *
     * @returns {void}
     * @param {Object} turtle
     */
    pushTurtle(turtle) {
        if (!this._turtleList.includes(turtle)) this._turtleList.push(turtle);
    }

    /**
     * Returns the index of the turtle in the turtleList.
     *
     * @param {Object} turtle
     * @returns {Number} index
     */
    getIndexOfTurtle(turtle) {
        return this._turtleList.indexOf(turtle);
    }

    /**
     * Removes the turtle at the specified index from the turtleList.
     *
     * @param {Number} index - The index of the turtle to remove.
     * @returns {void}
     */
    removeTurtle(index) {
        if (index >= 0 && index < this._turtleList.length) {
            const turtle = this._turtleList[index];

            // Clear any active intervals to prevent memory leaks
            if (turtle.interval !== undefined) {
                const intervalId = turtle.interval;
                clearInterval(intervalId);
                turtle.interval = undefined;
            }

            this._turtleList.splice(index, 1);
        }
    }

    /**
     * Adds createjs related properties of turtles and turtlesStage.
     *
     * @param {Object} turtle
     * @param {Boolean} blkInfoAvailable
     * @param {Object} infoDict
     * @returns {void}
     */
    addTurtleStageProps(turtle, blkInfoAvailable, infoDict) {
        // Add x- and y- coordinates
        if (blkInfoAvailable) {
            if ("xcor" in infoDict) {
                turtle.x = infoDict["xcor"];
            }
            if ("ycor" in infoDict) {
                turtle.y = infoDict["ycor"];
            }
        }

        const turtlesStage = this._stage;

        // Each turtle needs its own canvas
        turtle.imageContainer = new createjs.Container();
        turtlesStage.addChild(turtle.imageContainer);
        turtle.penstrokes = new createjs.Bitmap();
        turtlesStage.addChild(turtle.penstrokes);

        turtle.container = new createjs.Container();
        turtlesStage.addChild(turtle.container);
        turtle.container.x = this.turtleX2screenX(turtle.x);
        turtle.container.y = this.turtleY2screenY(turtle.y);
    }

    /**
     * Creates sensor area for Turtle body.
     *
     * @param {*} turtle - Turtle object
     * @returns {void}
     */
    createHitArea(turtle) {
        const hitArea = new createjs.Shape();
        hitArea.graphics.beginFill("#FFF").drawEllipse(-27, -27, 55, 55);
        hitArea.x = 0;
        hitArea.y = 0;
        turtle.container.hitArea = hitArea;
    }

    /**
     * Adds graphic specific properties of Turtle object.
     *
     * @param {Object} turtle
     * @param {Boolean} blkInfoAvailable
     * @param {Object} infoDict
     * @returns {void}
     */
    addTurtleGraphicProps(turtle, blkInfoAvailable, infoDict) {
        requestAnimationFrame(() => {
            if (blkInfoAvailable) {
                if ("heading" in infoDict) {
                    turtle.painter.doSetHeading(infoDict["heading"]);
                }

                if ("pensize" in infoDict) {
                    turtle.painter.doSetPensize(infoDict["pensize"]);
                }

                if ("grey" in infoDict) {
                    turtle.painter.doSetChroma(infoDict["grey"]);
                }

                if ("shade" in infoDict) {
                    turtle.painter.doSetValue(infoDict["shade"]);
                }

                if ("color" in infoDict) {
                    turtle.painter.doSetColor(infoDict["color"]);
                }

                if ("name" in infoDict) {
                    turtle.rename(infoDict["name"]);
                }
            }
        });
    }

    /**
     * Returns boolean value depending on whether turtle is running.
     *
     * @return {Boolean} - running
     */
    running() {
        const turtleCount = this.getTurtleCount();
        for (let i = 0; i < turtleCount; i++) {
            if (this.getTurtle(i).running) {
                return true;
            }
        }
        return false;
    }

    /**
     * @param {Number} i - index number
     * @returns {Object} ith Turtle object
     */
    ithTurtle(i) {
        return this.getTurtle(i);
    }

    /**
     * @param {Number} i - index number
     * @returns index number of companion turtle or i
     */
    companionTurtle(i) {
        const turtleCount = this.getTurtleCount();
        for (let t = 0; t < turtleCount; t++) {
            if (this.getTurtle(t).companionTurtle === i) {
                return t;
            }
        }
        return i;
    }

    /**
     * @returns number of turtles
     * (excluding turtles in the trash and companion turtles)
     */
    turtleCount() {
        let count = 0;
        const totalTurtles = this.getTurtleCount();
        for (let t = 0; t < totalTurtles; t++) {
            if (this.companionTurtle(t) === t && !this.getTurtle(t).inTrash) {
                count += 1;
            }
        }
        return count;
    }
};

/**
 * Class pertaining to Turtles View.
 *
 * @class
 * @classdesc This is the prototype of the View for the Turtles component.
 * It should make changes to the view, while using members of the Model
 * through Turtles (controller). An action may require updating the state
 * (of the Model), which it can do by calling methods of the Model, also
 * through Turtles (controller).
 */

Turtles.TurtlesView = class {
    /**
     * @constructor
     */
    constructor() {
        this._scale = 1.0; // scale factor in [0, 1]
        this._w = 1200; // stage width
        this._h = 900; // stage height

        this._isShrunk = false; // whether canvas is collapsed

        this._expandedBoundary = null; // The boundary when the canvas is expanded
        this._collapsedBoundary = null; // The boundry when the canvas is collapsed
        this._expandButton = null; // Button to expand the canvas
        this._collapseButton = null; // Button to collapse the canvas
        this._clearButton = null; // Button to clear the canvas
        this.gridButton = null; // Button to select the grid style
        this.collapse = null; // Function to collapse the canvas
        this.expand = null; // Function to expand the canvas

        // canvas background color
        this._backgroundColor = platformColor.background;

        this._locked = false; // whether the canvas is locked
        this._queue = []; // temporarily stores [w, h, scale]

        this.currentGrid = null; // currently selected grid

        // Debounce timer for resize events
        this._resizeTimer = null;

        // Attach a debounced event listener to the 'resize' event
        // This prevents rapid-fire resize calculations that can cause
        // crashes when toggling DevTools or switching tabs.
        window.addEventListener("resize", () => {
            if (this._resizeTimer) {
                clearTimeout(this._resizeTimer);
            }

            this._resizeTimer = setTimeout(() => {
                // Skip dimension updates when the tab is hidden
                // (canvas reports 0x0 in background tabs)
                if (document.hidden) {
                    return;
                }

                // Call the updateDimensions function when resizing occurs
                var screenWidth =
                    window.innerWidth ||
                    document.documentElement.clientWidth ||
                    document.body.clientWidth;
                var screenHeight =
                    window.innerHeight ||
                    document.documentElement.clientHeight ||
                    document.body.clientHeight;

                // Guard against zero or invalid dimensions
                if (screenWidth <= 0 || screenHeight <= 0) {
                    return;
                }

                // Set a scaling factor to adjust the dimensions based on the screen size
                var scale = Math.min(screenWidth / 1200, screenHeight / 900);

                // Calculate the new dimensions
                var newWidth = Math.round(1200 * scale);
                var newHeight = Math.round(900 * scale);

                // Update the dimensions
                this._w = newWidth;
                this._h = newHeight;
            }, 150);
        });
    }

    /**
     * Sets the scale of the turtle canvas.
     *
     * @param {Number} scale - scale factor in [0, 1]
     * @returns {void}
     */
    setStageScale(scale) {
        this.stage.scaleX = scale;
        this.stage.scaleY = scale;
        this.activity.refreshCanvas();
    }

    /**
     * Scales the canvas.
     *
     * @param {Number} w - width
     * @param {Number} h - height
     * @param {Number} scale - scale factor in [0, 1]
     * @returns {void}
     */
    doScale(w, h, scale) {
        if (this._locked) {
            this._queue = [w, h, scale];
        } else {
            this._scale = scale;
            this._w = w / scale;
            this._h = h / scale;
        }

        this.makeBackground();
    }

    /**
     * @returns {Boolean} - whether canvas is collapsed
     */
    isShrunk() {
        return this._isShrunk;
    }

    /**
     * @param {String} text
     * @returns {void}
     */
    setGridLabel(text) {
        this._gridLabel = text;
    }

    /**
     * Changes body background in DOM to current colour.
     *
     * @param {Number} index - Turtle index in turtleList
     * @returns {void}
     */
    setBackgroundColor(index) {
        const color =
            index === -1 ? platformColor.background : this.getTurtle(index).painter.canvasColor;
        this._backgroundColor = color;
        this.makeBackground();
        this.activity.refreshCanvas();
    }

    /**
     * Adds y offset to stage.
     *
     * @param {Number} dy - delta y
     * @returns {void}
     */
    deltaY(dy) {
        this.stage.y += dy;
    }

    /**
     * Invert y coordinate.
     *
     * @private
     * @param {Number} y - y coordinate
     * @returns {Number} inverted y coordinate
     */
    _invertY(y) {
        return this.canvas.height / (2.0 * this._scale) - y;
    }

    /**
     * Convert on screen x coordinate to turtle x coordinate.
     *
     * @param {Number} x - screen x coordinate
     * @returns {Number} turtle x coordinate
     */
    screenX2turtleX(x) {
        return x - this.canvas.width / (2.0 * this._scale);
    }

    /**
     * Convert on screen y coordinate to turtle y coordinate.
     *
     * @param {Number} y - screen y coordinate
     * @returns {Number} turtle y coordinate
     */
    screenY2turtleY(y) {
        return this._invertY(y);
    }

    /**
     * Convert turtle x coordinate to on screen x coordinate.
     *
     * @param {Number} x - turtle x coordinate
     * @returns {Number} screen x coordinate
     */
    turtleX2screenX(x) {
        return this.canvas.width / (2.0 * this._scale) + x;
    }

    /**
     * Convert turtle y coordinate to on screen y coordinate.
     *
     * @param {Number} y - turtle y coordinate
     * @returns {Number} screen y coordinate
     */
    turtleY2screenY(y) {
        return this._invertY(y);
    }

    /**
     * Creates the artwork for the turtle (mouse) 's skin.
     *
     * @param {Object} turtle
     * @param {Number} i
     * @returns {void}
     */
    createArtwork(turtle, i, useTurtleArtwork) {
        let artwork = useTurtleArtwork ? TURTLESVG : METRONOMESVG;
        artwork = artwork
            .replace(/fill_color/g, FILLCOLORS[i])
            .replace(/stroke_color/g, STROKECOLORS[i]);

        turtle.makeTurtleBitmap(artwork, this.activity, useTurtleArtwork);

        turtle.painter.color = i * 10;
        turtle.painter.canvasColor = getMunsellColor(
            turtle.painter.color,
            DEFAULTVALUE,
            DEFAULTCHROMA
        );
    }

    /**
     * Makes background for canvas: clears containers, renders buttons.
     *
     * @param setCollapsed - specify whether the background should be collapsed
     */
    makeBackground(setCollapsed) {
        const activity = this.activity;

        const doCollapse = setCollapsed === undefined ? false : setCollapsed;

        const borderContainer = this.borderContainer;

        // Remove any old background containers
        borderContainer.removeAllChildren();

        // Update the canvas background color
        const canvas = this.canvas;
        if (canvas) {
            canvas.style.backgroundColor = this._backgroundColor;
        }

        // Also update body background if available
        if (typeof document !== "undefined") {
            document.body.style.backgroundColor = this._backgroundColor;
        }

        const turtlesStage = this.stage;
        // We put the buttons on the stage so they will be on top

        const _makeButton = (svg, object, x, y) => {
            const container = document.createElement("div");
            container.setAttribute("id", "" + object.name);
            container.setAttribute("class", "tooltipped");
            container.setAttribute("data-tooltip", object.label);
            container.setAttribute("data-position", "bottom");
            window.jQuery(".tooltipped").tooltip({
                html: true,
                delay: 100
            });

            container.onmouseover = () => {
                if (!activity.loading) {
                    document.body.style.cursor = "pointer";
                    container.style.transition = "0.1s ease-out";
                    container.style.transform = "scale(1.15)";
                }
            };

            container.onmouseout = () => {
                if (!activity.loading) {
                    document.body.style.cursor = "default";
                    container.style.transition = "0.15s ease-out";
                    container.style.transform = "scale(1)";
                }
            };
            const img = new Image();
            img.src = "data:image/svg+xml;base64," + window.btoa(base64Encode(svg));
            img.setAttribute("alt", object.label || object.name || "Canvas button");

            // Batch DOM reads before writes to avoid forced synchronous layout
            const rightPos = document.body.clientWidth - x;
            container.appendChild(img);
            container.setAttribute(
                "style",
                "position: absolute; right:" + rightPos + "px;  top: " + y + "px;"
            );
            docById("buttoncontainerTOP").appendChild(container);
            return container;
        };

        /**
         * Setup dragging of smaller canvas .
         */
        const dragCanvas = () => {
            let offset;
            turtlesStage.removeAllEventListeners("pressmove");
            turtlesStage.removeAllEventListeners("mousedown");
            turtlesStage.on("mousedown", event => {
                offset = {
                    y: event.stageY - turtlesStage.y,
                    x: event.stageX - turtlesStage.x
                };
            });
            turtlesStage.on("pressmove", event => {
                const x = event.stageX - offset.x;
                const y = event.stageY - offset.y;
                turtlesStage.x = Math.max(0, Math.min((this._w * 3) / 4, x));
                turtlesStage.y = Math.max(55, Math.min((this._h * 3) / 4, y));
                activity.refreshCanvas();
            });
        };

        /**
         * Toggles visibility of menu and grids.
         * Scales down all 'turtles' in turtleList.
         * Removes the stage and adds it back at the top.
         */
        const __collapse = () => {
            this.hideMenu();
            this.activity.hideGrids();
            this.setStageScale(0.25);
            this._collapsedBoundary.visible = true;
            this._expandedBoundary.visible = false;
            turtlesStage.x = (this._w * 3) / 4 - 10;
            turtlesStage.y = 55 + LEADING + 6;
            this._isShrunk = true;

            for (let i = 0; i < this.getTurtleCount(); i++) {
                const turtle = this.getTurtle(i);
                turtle.container.scaleX = CONTAINERSCALEFACTOR;
                turtle.container.scaleY = CONTAINERSCALEFACTOR;
                turtle.container.scale = CONTAINERSCALEFACTOR;
            }

            // remove the stage and add it back at the top
            this.masterStage.removeChild(turtlesStage);
            this.masterStage.addChild(turtlesStage);
            dragCanvas();

            this.activity.refreshCanvas();
        };

        /**
         * Makes 'cartesian' button by initailising 'CARTESIANBUTTON' SVG.
         * Assigns click listener function to doGrid() method.
         */
        const __makeGridButton = () => {
            this.gridButton = _makeButton(
                CARTESIANBUTTON,
                {
                    name: "Grid",
                    label: _("Grid")
                },
                this._w - 10 - 3 * 55,
                70 + LEADING + 6
            );
            const that = this;
            this.gridButton.onclick = () => {
                piemenuGrid(that.activity);
            };
        };

        const __makeClearButton = () => {
            // Create the Clear button using the existing _makeButton helper
            this._clearButton = _makeButton(
                CLEARBUTTON,
                {
                    name: "Clear",
                    label: _("Clear")
                },
                this._w - 5 - 2 * 55,
                70 + LEADING + 6
            );

            // Assign click listener to the Clear button
            this._clearButton.onclick = () => {
                this.activity._allClear();
            };
        };

        /**
         * Makes collapse button by initailising 'COLLAPSEBUTTON' SVG.
         * Assigns click listener function to call __collapse() method.
         */
        const __makeCollapseButton = () => {
            this._collapseButton = _makeButton(
                COLLAPSEBUTTON,
                {
                    name: "Collapse",
                    label: _("Collapse")
                },
                this._w - 55,
                70 + LEADING + 6
            );

            this._collapseButton.onclick = () => {
                // If the aux toolbar is open, close it.
                const auxToolbar = docById("aux-toolbar");
                if (auxToolbar.style.display === "block") {
                    const menuIcon = docById("menu");
                    auxToolbar.style.display = "none";
                    menuIcon.innerHTML = "menu";
                    docById("toggleAuxBtn").className -= "blue darken-1";
                }
                this._expandButton.style.visibility = "visible";
                this._collapseButton.style.visibility = "hidden";
                this.activity.helpfulWheelItems.forEach(ele => {
                    if (ele.label === "Expand") {
                        ele.display = true;
                    } else if (ele.label === "Collapse") {
                        ele.display = false;
                    } else if (ele.label === "Grid") {
                        ele.display = false;
                    }
                });
                __collapse();
            };
        };

        this.collapse = () => {
            const auxToolbar = docById("aux-toolbar");
            if (auxToolbar.style.display === "block") {
                const menuIcon = docById("menu");
                auxToolbar.style.display = "none";
                menuIcon.innerHTML = "menu";
                docById("toggleAuxBtn").className -= "blue darken-1";
            }

            this._expandButton.style.visibility = "visible";
            this._collapseButton.style.visibility = "hidden";
            this.gridButton.style.visibility = "hidden";
            this.activity.helpfulWheelItems.forEach(ele => {
                if (ele.label === "Expand") {
                    ele.display = true;
                } else if (ele.label === "Collapse") {
                    ele.display = false;
                } else if (ele.label === "Grid") {
                    ele.display = false;
                }
            });
            __collapse();

            if (docById("helpfulWheelDiv").style.display !== "none") {
                docById("helpfulWheelDiv").style.display = "none";
                this.activity.__tick();
            }
        };

        /**
         * Makes expand button by initailising 'EXPANDBUTTON' SVG.
         * Assigns click listener function to remove stage and add it at posiion 0.
         */
        const __makeExpandButton = () => {
            this._expandButton = _makeButton(
                EXPANDBUTTON,
                {
                    name: "Expand",
                    label: _("Expand")
                },
                this._w - 55,
                70 + LEADING + 6
            );
            if (this._expandButton !== null) {
                this._expandButton.style.visibility = "hidden";
            }

            this._expandButton.onclick = () => {
                this.expand();
            };
        };

        this.expand = () => {
            // If the aux toolbar is open, close it.
            const auxToolbar = docById("aux-toolbar");
            if (auxToolbar.style.display === "block") {
                const menuIcon = docById("menu");
                auxToolbar.style.display = "none";
                menuIcon.innerHTML = "menu";
                docById("toggleAuxBtn").className -= "blue darken-1";
            }
            this.hideMenu();
            this.setStageScale(1.0);
            this._expandedBoundary.visible = true;
            this.gridButton.style.visibility = "visible";
            this._collapseButton.style.visibility = "visible";
            this._expandButton.style.visibility = "hidden";
            this.activity.helpfulWheelItems.forEach(ele => {
                if (ele.label === "Expand") {
                    ele.display = false;
                } else if (ele.label === "Collapse") {
                    ele.display = true;
                } else if (ele.label === "Grid") {
                    ele.display = true;
                }
            });
            this._collapsedBoundary.visible = false;
            turtlesStage.removeAllEventListeners("pressmove");
            turtlesStage.removeAllEventListeners("mousedown");

            turtlesStage.x = 0;
            turtlesStage.y = 0;
            this._isShrunk = false;

            for (let i = 0; i < this.getTurtleCount(); i++) {
                const turtle = this.getTurtle(i);
                turtle.container.scaleX = 1;
                turtle.container.scaleY = 1;
                turtle.container.scale = 1;
            }

            this._clearButton.scaleX = 1;
            this._clearButton.scaleY = 1;
            this._clearButton.scale = 1;
            this._clearButton.x = this._w - 5 - 2 * 55;

            if (this.gridButton !== null) {
                this.gridButton.scaleX = 1;
                this.gridButton.scaleY = 1;
                this.gridButton.scale = 1;
                this.gridButton.x = this._w - 10 - 3 * 55;
                this.gridButton.visible = true;
            }

            // Restore the previously selected grid
            if (this.currentGrid !== null) {
                this.activity.turtles.doGrid(0);
            }

            // remove the stage and add it back in position 0
            this.masterStage.removeChild(turtlesStage);
            this.masterStage.addChildAt(turtlesStage, 0);

            if (docById("helpfulWheelDiv").style.display !== "none") {
                docById("helpfulWheelDiv").style.display = "none";
                this.activity.__tick();
            }
        };

        /**
         * initializes all Buttons.
         */
        const __makeAllButtons = () => {
            let second = false;
            if (docById("buttoncontainerTOP")) {
                window.jQuery(".tooltipped").tooltip("close");
                docById("buttoncontainerTOP").parentElement.removeChild(
                    docById("buttoncontainerTOP")
                );
                second = true;
            }
            const cont = document.createElement("div");
            document.body.appendChild(cont);
            cont.style.display = second ? "block" : "none";
            cont.setAttribute("id", "buttoncontainerTOP");
            __makeCollapseButton();
            __makeExpandButton();
            __makeClearButton();
            __makeGridButton();
            jQuery
                .noConflict()(".tooltipped")
                .each(function () {
                    window.jQuery(this).tooltip({
                        html: true,
                        delay: 100
                    });
                });
            this._locked = false;
        };

        /**
         * Makes second boundary for graphics (mouse) container by initialising 'MBOUNDARY' SVG.
         */

        const handleCanvasResize = () => {
            // Get the new canvas width and height after resizing
            const newCanvasWidth = window.innerWidth;
            const newCanvasHeight = window.innerHeight;

            // Update the canvas dimensions
            this._w = newCanvasWidth;
            this._h = newCanvasHeight;

            // Calculate new SVG container dimensions
            // const dx = newCanvasWidth - 20;
            // const dy = newCanvasHeight - 55 - LEADING;
        };

        const __makeBoundary2 = () => {
            const img = new Image();
            img.onload = () => {
                if (this._collapsedBoundary !== null) {
                    this._collapsedBoundary.visible = false;
                }

                this._collapsedBoundary = new createjs.Bitmap(img);
                this._collapsedBoundary.x = 0;
                this._collapsedBoundary.y = 55 + LEADING;
                borderContainer.addChild(this._collapsedBoundary);
                this._collapsedBoundary.visible = false;
            };

            const dx = this._w - 20;
            const dy = this._h - 55 - LEADING;
            img.src =
                "data:image/svg+xml;base64," +
                window.btoa(
                    base64Encode(
                        MBOUNDARY.replace("HEIGHT", this._h)
                            .replace("WIDTH", this._w)
                            .replace("Y", 10)
                            .replace("X", 10)
                            .replace("DY", dy)
                            .replace("DX", dx)
                            .replace("stroke_color", platformColor.ruleColor)
                            .replace("fill_color", this._backgroundColor)
                            .replace("STROKE", 20)
                    )
                );
            __makeAllButtons();
        };
        // Call the __makeBoundary2 function once the document is loaded
        /**
         * Makes boundary for graphics (mouse) container by initialising
         * 'MBOUNDARY' SVG.
         */
        const __makeBoundary = () => {
            this._locked = true;
            const img = new Image();
            img.onload = () => {
                if (this._expandedBoundary !== null) {
                    this._expandedBoundary.visible = false;
                }

                this._expandedBoundary = new createjs.Bitmap(img);
                this._expandedBoundary.x = 0;
                this._expandedBoundary.y = 55 + LEADING;
                borderContainer.addChild(this._expandedBoundary);
                __makeBoundary2();
            };

            const dx = this._w - 5;
            const dy = this._h - 55 - LEADING;
            img.src =
                "data:image/svg+xml;base64," +
                window.btoa(
                    base64Encode(
                        MBOUNDARY.replace("HEIGHT", this._h)
                            .replace("WIDTH", this._w)
                            .replace("Y", 10 / CONTAINERSCALEFACTOR)
                            .replace("X", 10 / CONTAINERSCALEFACTOR)
                            .replace("DY", dy)
                            .replace("DX", dx)
                            .replace("stroke_color", platformColor.ruleColor)
                            .replace("fill_color", this._backgroundColor)
                            .replace("STROKE", 20 / CONTAINERSCALEFACTOR)
                    )
                );
        };

        if (!this._locked) {
            __makeBoundary();
        }

        // Debounce or throttle the resize event based on device capability
        let resizeTimeout;
        let ticking = false;

        window.addEventListener("resize", () => {
            const isHighEndDevice =
                navigator.hardwareConcurrency && navigator.hardwareConcurrency >= 4;

            if (isHighEndDevice) {
                if (!ticking) {
                    window.requestAnimationFrame(() => {
                        handleCanvasResize();
                        __makeBoundary();
                        __makeBoundary2();
                        ticking = false;
                    });
                    ticking = true;
                }
            } else {
                clearTimeout(resizeTimeout);
                resizeTimeout = setTimeout(() => {
                    handleCanvasResize();
                    __makeBoundary();
                    __makeBoundary2();
                }, 150); // Wait 150ms after the last resize event to execute
            }
        });

        return this;
    }
};

if (typeof module !== "undefined" && module.exports) {
    module.exports = Turtles;
}

if (typeof window !== "undefined") {
    window.Turtles = Turtles;
}